582 ON NEW SPECIES OF LAND-SHELLS. [Nov. 19, 



Note on Bulimus fulminans. 



Specimens of a supposed new species of Bulimus from Mount 

 Roraima, Brit. Guiana, liaving recently been presented by Miss 

 Linter to the Natural History Museum, South Kensington, I was 

 asked to give my opinion upon it, and to describe it if new. Com- 

 paring it with B. fulminans (Nyst), B. blainvil.leanus (Pfr.), and 

 B. loveni (Pfr.), it seemed pretty evident that if these could be 

 properly considered as three species, the Mount Roraima one must 

 constitute a fourth. Upon careful comparison, however, of the 

 different forms I have come to the conclusion that they are simply 

 geographical forms or varieties of one species. Though differing in 

 size and form, all agree in the essential characters peculiar to the 

 species, namely the close, regular, longitudinal striation of the upper 

 whorls, followed upon the body-whorl by a curious rough malleation 

 having an oblique tendency opposite to that of the striae. The only 

 noticeable variation is in the relative proportions of these characters ; 

 the regular striation in some specimens being confined to the upper 

 whorls, and in others covering part of the body-whorl. We have 

 then : — 



Bulimus fulminans (Nyst). 



Typical form. Spire conical, rather produced ; outer lip con- 

 siderably thickened ; longitudinal waved dark brown lines, rather 

 conspicuous upon the lightish brown colour of the shell. The 

 Museum specimens are from the Grota de Guacharos, near Caripe, 

 Colombia. 



Var. blainvilleana {Bulimus llainvilleanus, Pfr.). Rather larger 

 than type, of lighter substance, shorter spire, more inflated body- 

 whorl, darker colour with waved or zigzag markings obscure. 



Hab. Taji, Prov. of Merida, Venezuela. 



Var. loveni {Bulimus loveni, Pfr.). Smaller than type, of very 

 thin substance, lightish colour, with zigzag markings conspicuous. 



Hab. Venezuela. 



Var. lintercB (Sowerby), Plate LVI. fig. 12. Smaller than type, 

 about the size of var. loveni, than which it is more solid, with a 

 more produced spire and narrower body-whorl. The zigzag markings 

 are only faintly visible in some specimens. 



Hab. Mount Roraima, British Guiana. 



EXPLANATION OF PLATE LVI. 



Fig. 1. Helix {Geofrochus) hordcri, ]). ^77. 



2. Achatina barriana, p. 579. 



3. smithi, p. 579. 



4. Bulimus salieri, p. 578. 



5. (Mesembrinus?) bowkeri, p. 581. 



6. Helix {Corasia) woodfordi, p. 578. 



7. Bulimus {Buliminus ?) hanningtoni, p. 580. 



8. ( ) gome::i, p. 580. 



9. super sir iatus, p. 578. 



10. Trochomorpha godeti, p. 578. 



11. Achatina linterce, p. 580. 



12. Bulimus fulminans, var. Untcra, p. 582. 



13. Lcptopoina woodfordi, p. 581. 



14. Cyclostoma hanningtoni, p. 681. 



